Mechanic&#39;s square



July 25, C;- GRlF-FIN MECHANIG S SQUARE Filed April 15, 1931 ANH.

Patented July 25, 1933 UNITED STATES PATENT OFFICE CLAUDE GRIFFIN, F PORTLAND, OREGON, ASSIG-NOR OF ONE-HALF SUN SERIE, OF PORTLAND, OREGON TO SAMUEL MEGHANICS SQUARE Application filed April 15, 1931. Serial No. 530,291.

The primary purpose and object of my new and improved device consists in providing a mechanics square that may be used to form a. multiplicity of angles, ,as four right angles, a continuous line, or an angle tool composed of four sides and of two units to form angles of various degrees, each of which Will be accurately formed and that will remain so over relatively long operating periods Without adjustment, repair, or

alteration.

A further object of my new and improved device consists in four graduated side elements, which may be assembled together 1n the form of an enclosed square, or may be grouped together in various` shapes vand lengths to accomplish the desired purpose Vof the uses of the same.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claim, and a preferred form of embodiment of which is hereinafter shown with reference to the draw ing which accompanies and forms a part of this specification.

In the drawing Fig. l is a front element of the assembled elements to form a four sided square, each corner of which forms a right angle. Fig. 2 illustrates the elements assembled together in a continuous length to form a graduated measuring tool adapted for use by mechanics and others in linear measurements. A

Fig. 3 is a side elevation of two of the units assembled together to form an obtuse angle on two sides and acute angles on two sides of the meeting graduated surfaces.

Fig. 4 is an end view of the assembled unit at the engaging ends.

Fig. 5 is a perspective view of one of the units shown disassembled from the others.

Fig. 6 is a fragmentary, perspective, end view of one end of one of the disassembled units. Y Y

Like reference characters refer to like parts throughout the several views.

I preferably form my new and improved device of four elements l, 2, 3 and 4,'each being graduated along one or more of its surfaces, as illustrated at 5 and 6, so that each element may be used as a measuring device as well as to form right angles at each corner, the same may be then assembled, as illustrated in Fig. 2, to form a measuring instrument composed of four elements, secured together for making linear measurement. The engaging ends being secured together by any suitable fastening means, as by slip joints, illustrated in Fig. 4, `as by dovetailed joints. Additional connections may be formed upon each of the individual elements to which any of the other elements may be attached by any vsuitable fastening means, as by havingupwardly extending lugs 7, whose surfaces 8 and 9`may be formed at right angles to the edges l0 and which when assembled with the oppositely disposed Y end of the engaging element would form a right angle, or the extending surfaces l1 having edges l2 and 13, which are substantially parallel may be made to engage the end section of the associated element to form an angle greater or less than a right angle. Each of the upwardly extending surfaces, as illustrated in Fig. 5, at 14 and l5, may be formed at any desired angle so that when the associated units are assembled together any desired angle formerly predetermined may be created by the engaging units.

While the form of instrument herein shown and described is adapted to fulfill the object primarily stated, it isrto be Vunderstood that it is not intended. to confine the invention to the one form of embodiment herein shown and described, as it is susceptible of embodiment in yvarious forms, all

coming within the scope of the claim which Y follows:

l/Vhat I claim'is:- l Y A mechanics square of the class described, comprising two pairs of elongated graduatedbody elements, each element of one pair of said elements having a dovetail groove running longitudinally therein, each of the other pair of said elements having a plurality of dovetails offset therefrom, said dovetails being disposed upon the elements at varying angles and adapted to slidably move` within the grooves sothat definite angles may be formed between two connected elements or an extended linear rule may be formed when desired.

CLAUDE GRIFFIN.- 

